_decrypt(encrypted_message) private

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# File activesupport/lib/active_support/message_encryptor.rb, line 79
    def _decrypt(encrypted_message)
      cipher = new_cipher
      encrypted_data, iv = encrypted_message.split("--").map {|v| ::Base64.decode64(v)}

      cipher.decrypt
      cipher.key = @secret
      cipher.iv  = iv

      decrypted_data = cipher.update(encrypted_data)
      decrypted_data << cipher.final

      @serializer.load(decrypted_data)
    rescue OpenSSLCipherError, TypeError
      raise InvalidMessage
    end
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